Envelope Machines: Gumming and Sealing
Gumming and other sealing techniques
Most envelopes produced use dextrine gumming (also known as remoistable).
However, if you need to apply special shape of gumming on the seal flap
or body of the envelope there are machines which feed finished envelopes
by opening the flap and apply gumming (either dextrine [remoistable],
latex [self seal], or silicon tape). Other machines can apply clasps
or string and two buttons.
Envelope Gumming Machine Envelope After Gumming
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here for more information on envelope production or to see a complete
list of used envelope machines